Longo



No. 608,!6l.

v T. E. p: SOTULONGU.

FURNACE FUR BOILERS 0F LOCUMOTIVE TYPE.

Patented July 26', I898.

(Application filed July ,9, 1897.)

(No Model.)

Tn: Nomus PETERS can PHOTO-LITNQ. WASHINGTON, u z,

FFlCEt TOMAS E. DE SOTOLONGO, OF NEW YORK, N. Y.

FURNACE FOR BOILERS OF LOCOMOTIVE TYPE.

SPECIFICATION forming partof Letters Patent No. 608,161, dated July 26, 1898. Application filed m 9, 1 897; $ria1llo.t43,961. (No man.)

tion. The principal object of e the improve-' ment is to obtain such a furnace in which such fuel so introduced may be effectively and economically burned which shall be capable of resisting the verydestructive eifects to which boiler-furnaces aresubject in the use of fuel of that kind so introduced by reason of the Very intense heat developed.

To enable others skilled in the art to apply my invention to practical will describe it with reference to the accompanying drawings,

and I will afterward point out its-novelty in claims.

The drawings illustrate the invention as applied to a multitubular boiler of the locomotive type. r 1 I Figure 1 represents a central longitudinal vertical section of a boiler in the fire-box or combustion-chamber .of which my improvement is embodied. Fig. 2 representsa transverse vertical section in the line 2 2 of Fig. 1. Fig. 3 is an external View of a portion of one side of the fire-chamber, illustrating certain details of the invention hereinafter described. Fig. 4C is a horizontal section in the line 4 4 of Fig. 3.

Similar letters of reference designate corresponding parts in all the figures. A designates what I term the fire-chamber, which is like what is known as the firebox or combustion-chamber of an. ordinary locomotive-boiler, except that it is tightly closed at the bottom and has no grate. This chamber or box is lined throughout its sides, front, crown, and bottom with fire-brick, as indicated at a a.

Across the rear portion of the chamber A, at a short distance from the rear tube-sheet O and closely fitting to the crown, bottom, and sides of the chamber, is a shield B, which may consist of a suitable number of slabs of any refractory material, as fire-clay, or may be built up of fire-bricks suitably fastened together. This shield is perforated to correspond with'the tube-openings in the tubesheet, and its perforations b are somewhat larger than the bores of the boiler-tubes c in order to permit the free introduction, through said shield and into the tubes, of brushes or said tubes. The space at between the shield B and the tube-sheet 0 provides for the dropping down-between the tube-sheet and the shield of any deposit which may be withdrawn through the front end of the tubes, and the other suitable implements for cleaning the said space has an opening 6 at the bottom of p the chamber A, to which is fitted a valve or shutter f, which may be opened to permit the exit of the collected deposits, but which may be at other times open or closed, as may be desirable.

Across'jthe chamber A, from side to side thereof, close to the shield B, just below the lower tubes 0, there is built or placed an arch ;D. I prefer to extend this arch forward from the shield B more than half the length of the chamber A. The front of the said arch is open'to the fire-chamber, but it is closed to the chamber at its rear below the tubes 0. Ata lower level than the arch D another arch E is built across the forward portion of the chamber A from side to side thereof, the said arch being open to the chamber A at its rear, but closed to the said chamber at its front. I prefer to extend this arch backward from the front of the chamber A more'than half the length thereof, so that it is overlapped some distance by the arch D, with an opening 9 between them. The arches D. and E are represented astruearcs, but their form is immaterial, as they may be made fiat, and

as having in its front, above the arches D and E, an opening fitted with an ordinary furnace-door G, which may only need to be opened to get access to the interior of the chamber for repair or cleaning, but which may be opened for the introduction of coal, as hereinafter described, in case of necessity.

The operation of the furnace (shown in Figs. 1 and 2) is as follows: A blast of air, carrying with it the fuel, enters through the conduit F into the lower part of the chamber A through the arch E, and on the mixture of fuel and air being ignited combustion will commence in the lower part of the chamber A below the arch E, but a considerable portion of the fuel will be carried by the blast under the arch D, and the combustible gases generated below the arches E and D will pass, together with the unignited fuel and uncombined air, through the opening 9 between the arches into the upper portion of the chamber A, wherein combustion will be entirely or nearly completed, the hot gases generated passing thence through the shield B and tubes 0. In this operation the circulation of the gases, air, and fuel first forward under the arches E and D, thence forward under the arch D and through the opening 9 between the two arches, and thence forward, upward, and backward through the upper part of the fire-chamber produces such a perfect and intimate mixture of all the combustible matters that the most intense and perfect combustion is obtained, while the crown, sides, and front of the fire-chamber and the tube-sheet O are protected by the lining a and shield 13 from the intense heat generated. Suchprotection, especially as to the tube-sheet d and the ends of the tubes therein, is further provided by the arch D, which prevents the flame from rushing in violent currents directly to the tubes.

The space cl between the shield B and the tube-sheet besides providing for the cleaning of the tubes may, when necessary, serve the additional purpose of an air-duct for admitting air to mix with the gaseous products of the combustion in the fire-chamber at their entrance to the tubes, and thus complete the combustion of any portion of said products that may not have undergone perfect combustion. This admission of air may be controlled by the manipulation of the valve f by i the engineer or fireman, the said valve being provided with a rod J, running to the cab of the locomotive.

simple blowing apparatus to which the fuel brought to the locomotive in an already-pulverized condition may be suitably fed, the

blast-pipe of said pulverizing and blowing apparatus or of said blowing apparatus being connected with the conduit F. In case of emer- I gency -for example, such disorganization of the said apparatus as might render it inoperative-it is desirable to provide temporarily to complete a trip, for examplefor running without the blast and for feeding the fuel at the door G onto the arches E and D. For the purpose of supplying the necessary air for the combustion of the fuel so introduced I provide through the water-legs and front of the fire-chamber below the arches D E numerous air-openings h and 2', which are fitted with plugs or stoppers j. These stoppers are retained in the said openings while the pulverizing and blowing apparatus are in operation; but when that operation ceases and fuel is fed at the door G the said stoppers are withdrawn to admit air freely from the outside atmosphere, the said air being introduced by natural draft or by the draft produced by the steam-blast in the smoke-box of the locomotive. When the fuel is used, as just described, on the arches D E, the blast through the conduit F may be discontinued. The said stoppersj are represented as consisting of taper-plugs fitted to openings hi of corresponding form and as being secured in place (see Figs. 2, 3, and 4) by wedges 70, inserted through metal straps Z, attached to the outside of the boiler above and belowthe plugs, the said wedges bearing against the heads of the plugs. By knocking out these wedges the plugs can be easily removed.

What I claim as my invention is- 1. In a furnace for a boiler of the locomotive type, two arches arranged across the firechamber at different levels below the boiler-tubes, one of said arches being closed to the fire-chamber at the rear of the latter but open toward the front thereof and the other of said arches being closed to the firechamber at the front of the latter but open toward the rear thereof, a blast-conduit entering the fire-chamber under the lower arch for the introduction thereinto of air and fuel together, air-openings through the sides of the fire-chamber below the said arches and means for closing said openings, substantially as herein described.

2. In a furnace for a boiler of the locomotive type, a shield of refractory material perforated to correspond with the tube-openings in the tube-sheet and arranged across the fire chamber at a distance from the tubesheet with an opening at the bottom of the space between the said shield and tube-sheet,

and a valve for controlling said opening, substantially as herein described.

TOMAS E. DE SOTOLONGO. Witnesses:

O. F. DE NAVARRO, WAYNE CANFIELD. 

